interface _CS_ {
    /**
     * 首字母大写
     * @param str 字符串
     * @returns 字符串
     */
    capitalize(str: string): string;
}
{
    Object.defineProperty(_CS_.prototype, 'capitalize', {
        writable: false,
        configurable: false,
        enumerable: false,
        value: (str: string) => {
            return str.charAt(0).toUpperCase() + str.slice(1);
        }
    });
}
